Car Bounces after 60 ft. What is causing this??

Traction Dynamics said
You have to remember that your shocks have the same mileage on them as your trailer.

My first thought was the "rears" going away.

sbmmustang said
What size is the tire? But that seems to too low!

Needing under 10lbs these days, is usually covering for another issue somewhere? Unless you're running a dragster. :)